scholarly journals Bi3+ Effects on Down-/up-conversion Luminescence, Temperature Sensing and Optical Transition Properties in Bi3+/Er3+ Co-doped YNbO4  Phosphors

2020 ◽  
Author(s):  
Xin Wang ◽  
Xiangping Li ◽  
Hongquan Yu ◽  
Sai Xu ◽  
Jiashi Sun ◽  
...  
Keyword(s):  
Near Infrared ◽  
Optical Transition ◽  
Green Emission ◽  
Radiative Transition ◽  
Solid State Reaction Method ◽  
Temperature Sensing ◽  
Infrared Light ◽  
Luminescence Spectra ◽  
Experimental Values ◽  
Co Doped

Abstract A series of Bi3+ single-doped and Bi3+/Er3+ co-doped YNbO4 phosphors with various concentrations of Bi3+ ions were prepared by a conventional high temperature solid-state reaction method. The results of XRD and Rietveld refinement confirmed that monoclinic phase YNbO4 samples were achieved. The down-/up-conversion luminescence of Er3+ ions were investigated under the excitation of ultraviolet light (327 nm) and near infrared light (980 nm). Under 327 nm excitation, broad visible emission band from Bi3+ ions and characteristic green emission peaks from Er3+ ions were simultaneously observed, while only strong green emissions from Er3+ ions were detected upon excitation of 980 nm. Remarkable emission enhancement was observed in down-/up-conversion luminescence processes by introducing Bi3+ ions into Er3+-doped YNbO4 phosphors. By analyzing the laser working current dependent up-conversion luminescence spectra, two-photon processes were confirmed to be responsible for both the green and the red up-conversion emissions of Er3+ ion. The temperature sensing property of Er3+ was studied by using the temperature dependent up-conversion luminescence spectra and it was found that the temperature sensitivity was sensitive to the doping concentration of Bi3+ ions. By comparing the experimental values of the radiative transition rate ratio of the two green emission levels of Er3+ ions and the theoretical values calculated by Judd-Ofelt (J-O) theory, it was concluded that energy level splitting had significant influences on the temperature sensing property of Er3+ ions.

Near-infrared Light-mediated Er3+ and Yb3+ co-doped CaTi4O9 for Optical Temperature Sensing Behavior

2020 ◽  
pp. 117737
Author(s):  
Prashansha Singh ◽  
Neha Jain ◽  
Anish Kumar Tiwari ◽  
Shraddha Shukla ◽  
Vikas Baranwal ◽  
...  
Keyword(s):  
Near Infrared ◽  
Temperature Sensing ◽  
Infrared Light ◽  
Near Infrared Light ◽  
Co Doped

scholarly journals Florescence Intensity Ratio Thermometer in the First Biological Window Based on Non-Thermally Coupled Energy Levels of Tm3+ and Ho3+ Ions

2021 ◽  
Vol 8 ◽  
Author(s):  
Liang Li ◽  
Haoyue Hao
Keyword(s):  
Near Infrared ◽  
Energy Levels ◽  
Temperature Sensing ◽  
Infrared Light ◽  
Light Region ◽  
Potential Applications ◽  
Intensity Ratios ◽  
Sensing Sensitivity ◽  
Co Doped ◽  
Fluorescence Peak

In this study, the up-conversion luminescence and optical temperature sensing properties of Ho3+/Tm3+/Yb3+-co-doped NaLuF4 phosphors were investigated. The visible (475, 540, and 650 nm) and near-infrared light (692 and 800 nm) radiated from 1Ho3+/4Tm3+/Yb3+-co-doped NaLuF4 phosphors were obvious enough for subsequent detection. The slopes in the lnI–lnP plot of the emissions located in the first biological window (650, 692, and 800 nm) were both ∼1.5, which mean that the power had little effect on the three fluorescence peak ratios. Based on the florescence intensity ratios (FIRs) of 650 and 692 nm, the relative sensing sensitivity reaches 0.029 K−1 (476 K). The relative sensing sensitivity based on the FIRs of 800 and 692 nm reaches 0.0076 K−1 (476 K). The results reveal that 1Ho3+/4Tm3+/Yb3+-co-doped NaLuF4 phosphors have potential applications in FIR-based temperature sensing in biological tissue for their high sensing sensitivity. In addition, the emission colors of the sample stabilize in the white light region as the temperature increased from 303 to 467 K, implying that it can also be used in white display.

scholarly journals Fluoroindate glasses co-doped with Pr3+/Er3+ for near-infrared luminescence applications

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Wojciech A. Pisarski ◽  
Joanna Pisarska ◽  
Marta Kuwik ◽  
Marcin Kochanowicz ◽  
Jacek Żmojda ◽  
...  
Keyword(s):  
Rare Earth ◽  
Near Infrared ◽  
Rare Earth Ions ◽  
Luminescence Spectra ◽  
Nonradiative Relaxation ◽  
Transfer Processes ◽  
Direct Excitation ◽  
Infrared Luminescence ◽  
Doped Glass ◽  
Co Doped

AbstractFluoroindate glasses co-doped with Pr3+/Er3+ ions were synthesized and their near-infrared luminescence properties have been examined under selective excitation wavelengths. For the Pr3+/Er3+ co-doped glass samples several radiative and nonradiative relaxation channels and their mechanisms are proposed under direct excitation of Pr3+ and/or Er3+. The energy transfer processes between Pr3+ and Er3+ ions in fluoroindate glasses were identified. In particular, broadband near-infrared luminescence (FWHM = 278 nm) associated to the 1G4 → 3H5 (Pr3+), 1D2 → 1G4 (Pr3+) and 4I13/2 → 4I15/2 (Er3+) transitions of rare earth ions in fluoroindate glass is successfully observed under direct excitation at 483 nm. Near-infrared luminescence spectra and their decays for glass samples co-doped with Pr3+/Er3+ are compared to the experimental results obtained for fluoroindate glasses singly doped with rare earth ions.

Single red emission from upconverting ZnGa2O4:Yb,Er nanoparticles co-doped by Cr3+

2020 ◽  
Vol 8 (19) ◽  
pp. 6370-6379 ◽  
Author(s):  
Bhupendra B. Srivastava ◽  
Santosh K. Gupta ◽  
Yuanbing Mao
Keyword(s):  
Hydrothermal Method ◽  
Near Infrared ◽  
Red Light ◽  
Infrared Light ◽  
Near Infrared Light ◽  
Red Emission ◽  
Co Doped

ZnGa2O4:Yb3+,Er3+,Cr3+ nanoparticles synthesized by a hydrothermal method and further annealing emit bright singular red light under 980 nm excitation and near-infrared light under 254 nm excitation.

Responsive polymer–fluorescent carbon nanoparticle hybrid nanogels for optical temperature sensing, near-infrared light-responsive drug release, and tumor cell imaging

Nanoscale ◽  
2014 ◽  
Vol 6 (13) ◽  
pp. 7443-7452 ◽  
Author(s):  
Hui Wang ◽  
Fuyou Ke ◽  
Anton Mararenko ◽  
Zengyan Wei ◽  
Probal Banerjee ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Drug Release ◽  
Tumor Cell ◽  
Near Infrared ◽  
Cell Imaging ◽  
Temperature Sensing ◽  
Infrared Light ◽  
Near Infrared Light ◽  
Carbon Nanoparticle ◽  
Responsive Polymer

The paper demonstrates the synthesis of carbon-based responsive hybrid nanogels and their applications including sensing, cell imaging and drug delivery.

A study on temperature sensing performance based on the luminescence of Eu3+ and Er3+ co-doped YNbO4

2020 ◽  
Vol 49 (24) ◽  
pp. 8194-8200 ◽  
Author(s):  
Jiashan Mao ◽  
Bin Jiang ◽  
Peng Wang ◽  
Liting Qiu ◽  
Muhammad Tahir Abass ◽  
...  
Keyword(s):  
High Temperature ◽  
Solid State ◽  
Solid State Reaction ◽  
Solid State Reaction Method ◽  
Temperature Sensing ◽  
Reaction Method ◽  
Co Doped ◽  
Sensing Performance

Eu3+ and Er3+ co-doped YNbO4 powder phosphors were synthesized by a traditional high-temperature solid-state reaction method.

Preparation and Luminescence Properties of Eu3+ Doped Niobium Silicate Glass Ceramics

2014 ◽  
Vol 1033-1034 ◽  
pp. 1101-1104
Author(s):  
Qiong Song ◽  
Chun Hui Su ◽  
Hong Bo Zhang ◽  
Xiao Wei Zhu
Keyword(s):  
Silicate Glass ◽  
Near Infrared ◽  
Glass Melting ◽  
Glass Ceramics ◽  
Heat Treating ◽  
Treatment Temperature ◽  
Infrared Light ◽  
Mass Composition ◽  
Luminescence Spectra ◽  
Niobium Silicate

niobium silicate glass with the mass composition of 35SiO2-25Nb2O5-20Na2O-10K2O- 7B2O3-3Eu2O3was synthesized by a traditional glass melting method. Glass ceramics containing Na2Nb8O21nanocrystals were prepared by heat treating the glass samples. The results of X-ray diffraction (XRD) indicated that the crystallite in the glass ceramics is Na2Nb8O21nanocrystals. The luminescence spectra showed the emission intensity of Eu3+doped glass ceramics was stronger than that of the glass matrix, and increased with the heat treatment temperature increasing..The transmittance of the glass ceramics can be up to 80% in the near-infrared light area.

Quantum Cutting Downconversion in Tb3+,Yb3+ Codoped Sr3AlO4F Phosphor

2013 ◽  
Vol 683 ◽  
pp. 172-175 ◽  
Author(s):  
Jia Yue Sun ◽  
Yi Ning Sun ◽  
Jun Hui Zeng ◽  
Ji Cheng Zhu ◽  
Hai Yan Du
Keyword(s):  
Energy Transfer ◽  
High Temperature ◽  
Solid State ◽  
Quantum Efficiency ◽  
Solid State Reaction ◽  
Near Infrared ◽  
Luminescence Spectra ◽  
Promising Candidate ◽  
Quantum Cutting ◽  
Co Doped

A near Infrared (NIR) quantum cutting (QC) Sr3AlO4F:Tb3+,Yb3+phosphor was synthesized by the conventional high temperature solid-state reaction. The luminescence spectra both in visible (VIS) and NIR regions and decay lifetime curves of Tb3+have been measured to prove energy transfer (ET) from Tb3+to Yb3+. Quantum efficiency (QE) related to Yb3+concentration was calculated and the highest QE was found to be 135% hen Yb3+doped concentration at 20%. The present Tb3+and Yb3+co-doped Sr3AlO4F phosphor may be a promising candidate to modify the spectral of the solar light.

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